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Variation of basic density,calorific value and volumetric shrinkage within tree height and tree age of Ugandan grown Eucalyptus grandis wood

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Journal of Forestry Research 2021年第2期32卷 503-512页

作者： Owen Emmanuel Sseremba P.Mugabi A.Y.Banana B.C.Wessels M.Plessis Department of Forestry Biodiversity and TourismMakerere UniversityKampalaUganda Department of Forestry and Wood Science Stellenbosch UniversityStellenboschSouth Africa

Insufficient knowledge on Ugandan grown Eucalyptus grandis *** ex Maiden wood properties,high demand,and processing challenges led to a study into its physical *** obtained the variation of basic density(BD),calorific value(CV)and volumetric shrinkage(VS)within tree height and tree-age of ***,and its appropriate use based on these *** with good boles were harvested from Kabarole District in western Uganda to produce specimens as prescribed by British Standards and ASTM standard wood testing *** data reviews and statistical analysis using ANOVA,Tukey’s test and multivariate analysis were done to obtain property estimates and their variation within trees and amongst tree *** mean BD of *** is 413.6,380.5,471.0,and 501.1 kg m^(−3)at 3,6,9,and 12 years,respectively,showing significant increase with tree age(p=0.003).The pattern of BD with tree height showed a reduction with tree height although with higher values in the middle portion of the *** CV increases(p=0.014)with tree age and reduces with tree height with values of 14,560.32,15,447.3,16,079.11,and 16,932.6 kJ kg^(−1)at 3,6,9,and 12 years,*** percentage VS was 11.02,9.84,12.31,and 14.45 for 3-,6-,9-,and 12-year-old trees,respectively,and it did not vary significantly(p=0.088)with tree *** on these property values,*** wood could be used for scaffolding,light constructions and fuel wood *** seasoning needs to be longer with well monitored drying schedules to reduce seasoning defects caused by the high *** studies on strength properties,seasoning schedules,panel products properties and tree-age chemical variations would improve the knowledge about its wood quality and would enhance its efficient utilization.

关键词： Eucalyptus grandis Age calorificvalue Basic density Volumetric shrinkage Wood

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